DFRobot Gas Sensor Selection Guide

What is Gas Sensor?

Gas sensors are mainly used for the detection of a specific gas, measuring the presence or absence of that gas in the sensor's vicinity or the amount of air in the sensor's vicinity.

Therefore, gas sensors are often indispensable in safety systems, where they can provide information on flammable, combustible and toxic gases, as well as the consumption of oxygen in the area, the percentage of carbon dioxide, etc. The common gas sensors available today can be classified according to the detection principle: electrochemical gas sensors, semiconductor gas sensors, infrared gas sensors, MEMS gas sensors,etc.

Characteristics of different principles

Electrochemical Gas Sensors: very low power consumption, high stability, high precision, susceptible to interfering gases, susceptible to temperature changes

Semiconductor Gas Sensors: low price, fast response, poor linearity difficult to measure specific values, susceptible to interfering gases, susceptible to temperature changes.

Infrared Gas Sensors: high stability, strong anti-interference ability, long life, can not be used in dusty and humid environment, higher price.

MEMS Gas Sensors: miniaturization, low power consumption, general accuracy

Oxygen / O2 Sensor

Product Name

Gravity: Electrochemical Oxygen / O2 Sensor (0-25%Vol, I2C)

Gravity: Factory Calibrated Electrochemical Oxygen / O2 Sensor (0-25%Vol, I2C & UART)

Gravity: Electrochemical Oxygen / O2 Sensor (0-100%Vol, I2C)

Figure

SKU

SEN0322

SEN0465

SEN0496

Quick start oxygen measurement

High precision, high stability

Full range oxygen concentration

Features

3.3V, 5V; 0~25%; Electrochemical

3.3V, 5V; 0~100%; Electrochemical

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Carbon Dioxide / CO2 Sensor

Product Name

Gravity: Analog Electrochemical Carbon Dioxide Sensor (0-10000 ppm)

Gravity: PWM Infrared Carbon Dioxide Sensor (400-5000 ppm)

Gravity: UART Infrared Carbon Dioxide Sensor (0-50000 ppm)

Figure

SKU

SEN0159

SEN0219

SEN0220

Carbon Dioxide Leak Warning

Accurate measurement of gas concentration

Large range, special environment can also be used

Features

3.3V, 5V; Qualitative analysis; Electrochemical

5V; 400～5000ppm; Infrared

4.5V, 5.5V; 400～50000ppm; Infrared

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Carbon Monoxide / CO Sensor

Product Name

Gravity: Analog CO Sensor (MQ7)

Gravity: CO Sensor (Calibrated) - I2C & UART

Figure

SKU

SEN0132

SEN0466

Slogan

Carbon Monoxide Leak Warning

High precision, high stability

Features

5V; Qualitative analysis; Semiconductor

3.3V, 5V; 0～1000ppm; Electrochemical

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Ozone / O3 Sensor

Product Name

Gravity: Electrochemical Ozone Sensor (0-10 ppm, I2C)

Gravity: O3 Sensor (Calibrated) - I2C & UART

Figure

SKU

SEN0321

SEN0472

Slogan

Factory calibrated, compact size

High precision, high stability

Features

3.3V, 5V; 0～10ppm; Electrochemical

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Alcohol Sensor

Product Name

Gravity: Analog Alcohol Sensor (MQ3)

Gravity: Alcohol Sensor - I2C&UART

Figure

SKU

SEN0128

SEN0376

Slogan

Alcohol Leak Warning

Factory calibrated, compact size

Features

5V; Qualitative analysis; Semiconductor

3.3V, 5V; 0～5ppm; Electrochemical

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Hydrogen / H2 Sensor

Product Name

Gravity: Analog Hydrogen Gas Sensor (MQ8)

Gravity: H2 Sensor (Calibrated) - I2C & UART

Figure

SKU

SEN0133

SEN0473

Slogan

Hydrogen Leak Warning

High precision, high stability

Features

5V; Qualitative analysis; Semiconductor

3.3V, 5V; 0～1000ppm; Electrochemical

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Sulfur Dioxide / SO2 Sensor

Product Name

Fermion: MEMS Gas Sensor - MiCS-2714

Gravity: SO2 Sensor (Calibrated) - I2C & UART

Figure

SKU

SEN0441

SEN0470

Time of Each Measurement

Compact size for easy integration

High precision, high stability

Distance Measurement Resolution

3.3V, 5V; 0.05～10ppm; MEMS

3.3V, 5V; 0～20ppm; Electrochemical

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Other Toxic Gas Sensors

Product Name

Gravity: Factory Calibrated Electrochemical Nitrogen Dioxide Sensor (0-20ppm, I2C&UART)

Gravity: H2S Sensor (Calibrated) - I2C & UART

Gravity: HF Sensor (Calibrated) - I2C & UART

Gravity: NH3 Sensor (Calibrated) - I2C & UART

Gravity: CL2 Sensor (Calibrated) - I2C & UART

Gravity: PH3 Sensor (Calibrated) - I2C & UART

Gravity: HCL Sensor (Calibrated) - I2C & UART

Figure

SKU

SEN0471

SEN0467

SEN0475

SEN0469

SEN0468

SEN0476

SEN0474

Features

3.3V, 5V; 0～20ppm

3.3V, 5V; 0～100ppm

3.3V, 5V; 0～10ppm

3.3V, 5V; 0～100ppm

3.3V, 5V; 0～20ppm

3.3V, 5V; 0～1000ppm

3.3V, 5V; 0～10ppm

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（Electrochemical principle，High precision, High stability）

Composite Combustible Gas Sensors

Product Name

Gravity: Analog CH4 Gas Sensor (MQ4) For Arduino

Gravity: Analog LPG Gas Sensor (MQ5) For Arduino

Gravity: Analog Gas Sensor (MQ2)

Gravity: Analog Propane Gas Sensor (MQ6)

Gravity: Analog CO/Combustible Gas Sensor (MQ9)

Figure

SKU

SEN0129

SEN0130

SEN0127

SEN0131

SEN0134

Slogan

Sensitive detection of methane, natural gas

Sensitive detection of butane, propane and methane

Sensitive detection of liquefied gas, propane, hydrogen

Sensitive detection of propane, butane, LPG

Sensitive detection of carbon monoxide, methane, LPG

Features

5V; Qualitative analysis

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（Semiconductor Principle/ Simultaneous detection of multiple gases/ Used for leak warning)

Composite Toxic Gas Sensor

Product Name

Gravity: MEMS Gas Sensor (CO, Alcohol, NO2 & NH3) - I2C - MiCS-4514

Fermion: MEMS Gas Sensor - MiCS-5524 (Breakout)

Figure

SKU

SEN0377

SEN0440

Slogan

Formaldehyde, ethanol, hydrogen, ammonia, carbon monoxide, nitrogen dioxide concentration detection

Formaldehyde, ethanol, hydrogen, ammonia, carbon monoxide concentration detection

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